As people get older, "they just have this sense, this feeling that time is going faster than they are," says Warren Meck, a psychology professor at Duke University.

This seems to be true across cultures, across time, all over the world.

No one is sure where this feeling comes from. Scientists have theories, of course, and one of them is that when you experience something for the very first time, more details, more information gets stored in your memory. Read more here.